The invention discloses a method for measuring the center of gravity of an unmanned aerial vehicle based on a cross weight measuring method. The method comprises the steps that a first weight measuring device and a second weight measuring device are separately used for carrying a nose and a tail of the unmanned aerial vehicle, and the first weight measuring device and the second weight measuring device separately measure the mass mf1 of the nose and the mass mr2 of the tail; the nose and the tail of the unmanned aerial vehicle are reversed, the first weight measuring device and the second weight measuring device are separately used for carrying the tail and the nose of the unmanned aerial vehicle, and the first weight measuring device and the second weight measuring device separately measure the mass mr1 of the tail and the mass mf2 of the nose; and combined with the principle of moments and the central geometric principle, the position of the center of gravity of the unmanned aerial vehicle can be calculated from the measured four masses. The difference between the weight measuring devices and the influence of the height of the own center of gravity of the unmanned aerial vehicleare eliminated, the two measuring devices do not need to be adjusted on a same horizontal line, the test condition requirements are greatly reduced, the accuracy of the measurement is improved, test steps are further simplified, and the test efficiency is improved.